Debt and Warrants - Debt (Details)														1 Months Ended								2 Months Ended	3 Months Ended			4 Months Ended	6 Months Ended		12 Months Ended
	Aug. 01, 2018 USD ($)	Jun. 29, 2017 USD ($) $ / shares	Jan. 31, 2017 USD ($) $ / shares shares	Nov. 29, 2016 $ / shares	Nov. 08, 2016 USD ($) $ / shares shares	Apr. 21, 2016 USD ($)	Aug. 18, 2015 USD ($)	Dec. 23, 2014 USD ($) item $ / shares shares	Dec. 03, 2014 USD ($) $ / shares	Jul. 16, 2014 USD ($) $ / shares shares	Jun. 26, 2014 USD ($) $ / shares shares	Jun. 26, 2014 USD ($) $ / shares shares	Jun. 02, 2014 USD ($) item $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Aug. 31, 2015 USD ($)	May 31, 2015 USD ($) shares	Apr. 30, 2015 $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Feb. 28, 2015 USD ($) item $ / shares shares	Aug. 31, 2014 USD ($) $ / shares shares	Feb. 28, 2014 USD ($) shares	Feb. 28, 2014 USD ($)	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) shares	Sep. 30, 2013 USD ($) item $ / shares shares	Aug. 31, 2016	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) shares	Dec. 31, 2016 USD ($) $ / shares	Jul. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 22, 2015 USD ($)	Jun. 30, 2015 USD ($)	Oct. 30, 2014 item
Debt and Warrants
Proceeds from issuance of convertible debt																											$ 1,700,000
Interest rate (as a percent)																														12.00%
Interest expense																							$ 156,129	$ 254,758			$ 336,201	$ 538,994
Number of warrants issued to purchase shares of common stock (in shares) | shares														2,196,533									2,196,533	26,785			2,196,533	26,785
Exercise price (in dollars per share) | $ / shares					$ 0.01
Loss on extinguishment of debt					$ 108,000																						$ 207,713
Notes payable																														$ 150,000
Interest payable on long-term debt														$ 42,855									$ 42,855				$ 42,855		$ 33,929
Term				5 years 6 months	5 years 8 months 19 days																						4 years 10 months 28 days		5 years 4 months 28 days
Derivative liability														$ 20,000									$ 20,000				$ 20,000
Strike price (in dollars per share) | $ / shares				$ 0.69	$ 0.91									$ 0.53									$ 0.53				$ 0.53		$ 0.716
Volatility (as a percent)				71.92%	70.35%																						80.51%		73.62%
Dividend yield (as a percent)				0.00%	0.00%																						0.00%		0.00%
Risk-free interest rate (as a percent)				1.87%	1.45%																						1.87%		2.00%
Stand-by line of credit							$ 8,000,000
Initial loan commitment							6,000,000
Proceeds required to be maintained in cash							$ 4,500,000																									$ 3,000,000
Repayment of loan from restricted cash						$ 1,500,000																					$ 3,000,000
Interest-only payments, term																										4 months
Long-term debt
Current portion of long-term debt														$ 2,071,646									$ 2,071,646				2,071,646		$ 1,919,675
Long-term debt, net of discount														835,976									835,976				835,976		1,817,526
Short-term debt
Notes payable																														$ 150,000
Net debt obligation														1,777,346									1,777,346				1,777,346		150,000
Interest payable on convertible notes payable														124,239									124,239				124,239		123,982
Transfer Agreement | Manufacturer
Debt and Warrants
Number of warrants issued to purchase shares of common stock (in shares) | shares											16,666	16,666
Exercise price (in dollars per share) | $ / shares																		$ 6.30
Exercise price as a percentage of initial public offering price											90.00%	90.00%
Warrants | Common Stock | Transfer Agreement | Manufacturer
Debt and Warrants
Number of warrants issued to purchase shares of common stock (in shares) | shares											16,666	16,666
Exercise price (in dollars per share) | $ / shares											$ 4.35	$ 4.35						$ 6.30
Exercise price as a percentage of initial public offering price											90.00%	90.00%
Term											5 years	5 years
Fair value of warrants											$ 37,840	$ 37,840
Strike price (in dollars per share) | $ / shares											$ 4.83	$ 4.83
Volatility (as a percent)											49.00%
Dividend yield (as a percent)											0.00%
Risk-free interest rate (as a percent)											1.64%
Standby bridge financing agreement
Debt and Warrants
Number of warrants issued to purchase shares of common stock (in shares) | shares																		178,569
Exercise price (in dollars per share) | $ / shares									$ 5.23
Term									5 years
Fair value of warrants									$ 505,348
Strike price (in dollars per share) | $ / shares									$ 5.01
Volatility (as a percent)									63.00%
Dividend yield (as a percent)									0.00%
Risk-free interest rate (as a percent)									1.61%
Number of lenders | item																																		2
Aggregate principal amount of bridge financing									$ 1,000,000
Interest Paid																$ 1,321,600
Value to be divided by IPO exercise price to determine number of warrants granted																		$ 1,000,000
Term of agreement									6 months
Standby bridge financing agreement | IPO
Debt and Warrants
Exercise price (in dollars per share) | $ / shares																		$ 5.60
Exercise price as a percentage of initial public offering price									80.00%
Standby bridge financing agreement | Interest Expense
Debt and Warrants
Unamortized note discount									$ 100,000
Additional financing costs									104,000
Long-term debt
Unamortized note discount									(100,000)
Short-term debt
Unamortized note discount									$ (100,000)
Convertible promissory notes
Debt and Warrants
Number of convertible promissory notes issued | item																									4
Proceeds from issuance of convertible debt																									$ 525,000
Interest rate (as a percent)																									8.00%
Number of business days after the date of consummation of the initial closing of a first equity round of financing, when the debt instrument is due																									10 days
Pre-money valuation threshold amount																									$ 3,000,000
Number of shares issued for notes converted | shares																					207,664
Interest expense																							4,488	$ 4,488			8,926	$ 8,975
Amortization of debt discount																					$ 4,071	$ 1,443
Number of warrants issued to purchase shares of common stock (in shares) | shares																			22,320
Exercise price (in dollars per share) | $ / shares																			$ 5.60
Notes payable														2,285,000					$ 250,000				2,285,000				2,285,000		150,000
Number of accredited investors | item																			2
Principal and interest paid on debt																103,912
Retirement of convertible promissory notes																$ 100,000
Long-term debt
Nominal interest																							4,960	4,487			9,398	8,975
Amortization of debt issuance costs																							1,346				1,346
Amortization of debt discount																					$ 4,071	$ 1,443
Amortization of Financing Costs																							1,346				1,346
Total																							6,306	4,487			10,744	8,975
Short-term debt
Notes payable														2,285,000					$ 250,000				2,285,000				2,285,000		150,000
Unamortized note discount and debt issuance costs														(507,654)									(507,654)				(507,654)
Net debt obligation														1,777,346									1,777,346				1,777,346		150,000
Nominal interest																							4,960	4,487			9,398	8,975
Amortization of debt issuance costs																							1,346				1,346
Total																							6,306	4,487			10,744	8,975
Convertible promissory notes | Accrued expenses
Debt and Warrants
Interest payable on long-term debt														103,446									103,446				103,446		94,048
Convertible promissory notes | Investor
Debt and Warrants
Interest rate (as a percent)																	12.00%
Number of shares issued for notes converted | shares																178,571
Number of warrants issued to purchase shares of common stock (in shares) | shares																	89,285
Exercise price (in dollars per share) | $ / shares																	$ 5.60
Notes payable																		$ 1,000,000
Interest payable on long-term debt														0									0	0			0	0					$ 17,753
Investment Warrants Expiration Date																	Dec. 31, 2017
Short-term debt
Notes payable																		$ 1,000,000
Convertible promissory notes | Warrants | Common Stock
Debt and Warrants
Exercise price as a percentage of purchase price paid by equity investors when pre-money valuation threshold amount is achieved																									75.00%
Number of warrants issued to purchase shares of common stock (in shares) | shares																									207,664
Exercise price (in dollars per share) | $ / shares																									$ 2.53
Warrant term																									5 years
Convertible promissory notes issued June 2, 2014
Debt and Warrants
Interest rate (as a percent)													3.00%
Number of shares issued for notes converted | shares													53,571
Exercise price (in dollars per share) | $ / shares													$ 5.60
Notes payable													$ 300,000
Interest payable on long-term debt														0									0	0			0	0			$ 8,507
Number of accredited investors | item													2
Aggregate principal amount issued to board member to which Series A preferred stock was sold													$ 200,000
Beneficial conversion feature													75,000
Short-term debt
Notes payable													$ 300,000
Convertible promissory note issued July 16, 2014
Debt and Warrants
Interest rate (as a percent)										3.00%
Number of shares issued for notes converted | shares										26,785
Exercise price (in dollars per share) | $ / shares										$ 5.60
Notes payable										$ 150,000
Interest payable on long-term debt														0									0	0			0	0			3,711
Beneficial conversion feature										37,500
Short-term debt
Notes payable										$ 150,000
Convertible promissory note issued June 29,2017
Debt and Warrants
Interest rate (as a percent)		8.00%
Notes payable		$ 2,155,000
Proceeds from issuance of convertible debt		$ 1,700,000
Strike price (in dollars per share) | $ / shares		$ 1.00
Unamortized note discount		$ 425,000
Debt legal fee		30,000
Long-term debt
Unamortized note discount		(425,000)
Debt instrument, periodic payment		$ 350,000
Debt instrument, frequency of periodic payment		monthly
Automatic increase in interest rate at the event of default		17.00%
Short-term debt
Notes payable		$ 2,155,000
Unamortized note discount		(425,000)
Convertible promissory note issued June 29,2017 | Current liabilities
Debt and Warrants
Notes payable		2,155,000
Derivative liability		20,000
Additional financing costs		509,000
Long-term debt
Fair value of derivative liability due to repayment of mandatory default		15,000
Fair value of derivative liability due to interest rate increase feature		5,000
Accretion of debt discount and debt issuance costs														1,346
Short-term debt
Notes payable		2,155,000
Net debt obligation		1,627,346
Convertible promissory note issued June 29,2017 | Interest Expense
Debt and Warrants
Interest expense		1,346
Convertible promissory note issued June 29,2017 | Interest Expense | Accrued expenses
Debt and Warrants
Interest payable on long-term debt		$ 472
Convertible note purchase agreement
Debt and Warrants
Proceeds from issuance of convertible debt								$ 650,000
Interest rate (as a percent)								12.00%
Number of warrants issued to purchase shares of common stock (in shares) | shares								58,035
Exercise price (in dollars per share) | $ / shares								$ 4.15										$ 5.60
Interest payable on long-term debt														0									0	0			0	0			$ 30,132
Number of accredited investors | item								3
Aggregate principal amount issued to board member to which Series A preferred stock was sold								$ 250,000
Debt discount, amortization period								190 days
Beneficial conversion feature								$ 502,057
Term								3 years
Fair value of warrants								$ 147,943
Strike price (in dollars per share) | $ / shares								$ 4.59
Volatility (as a percent)								49.00%
Dividend yield (as a percent)								0.00%
Risk-free interest rate (as a percent)								1.10%
Convertible note purchase agreement | IPO
Debt and Warrants
Number of shares issued for notes converted | shares								116,070
Exercise price as a percentage of initial public offering price								80.00%		5.60%
Convertible note purchase agreement | Investor | IPO
Debt and Warrants
Strike price (in dollars per share) | $ / shares																	$ 5.60
Line of credit and loan agreement
Debt and Warrants
Number of warrants issued to purchase shares of common stock (in shares) | shares																				33,333
Exercise price (in dollars per share) | $ / shares																				$ 6.40
Term																				2 years
Fair value of warrants																				$ 114,300
Strike price (in dollars per share) | $ / shares																				$ 8.00
Volatility (as a percent)																				52.00%
Dividend yield (as a percent)																				0.00%
Risk-free interest rate (as a percent)																				0.52%
Drawdown amount																		$ 0
Line of credit and loan agreement | IPO
Debt and Warrants
Exercise price (in dollars per share) | $ / shares																		$ 5.60
Exercise price as a percentage of initial public offering price																				80.00%
Line of credit and loan agreement | Maximum
Debt and Warrants
Stand-by line of credit																				$ 1,000,000
Loan and security agreement
Debt and Warrants
Interest rate (as a percent)															9.90%
Amortization of debt discount																							9,961	16,640			21,639	35,051
Unamortized note discount														20,854	$ 134,433								20,854				20,854		42,493
Stand-by line of credit															8,000,000
Initial loan commitment															6,000,000
Proceeds required to be maintained in cash															4,500,000
Additional borrowing capacity contingent on achievement of milestones															$ 2,000,000
Term of agreement															3 years
Effective interest rate															15.00%
Prior notification period required for pre-payment of principal and accrued interest (in days)															5 days
Long-term debt
Debt and unpaid accrued end-of-term payment														2,993,473									2,993,473				2,993,473		3,894,320
Unamortized note discount														(20,854)	$ (134,433)								(20,854)				(20,854)		(42,493)
Unamortized debt issuance costs														(64,997)									(64,997)				(64,997)		(114,626)
Total														2,907,622									2,907,622				2,907,622		3,737,201
Current portion of long-term debt														2,071,646									2,071,646				2,071,646		1,919,675
Long-term debt, net of discount														835,976									835,976				835,976		1,817,526
Debt instrument, periodic payment																											560,000
Nominal interest																							67,273	112,374			146,134	261,000
Amortization of debt discount																							9,961	16,640			21,639	35,051
Accretion of end-of-term payment																							41,505	69,331			90,160	146,027
Accretion of debt issuance costs																							31,085	51,924			67,524	87,940
Total																							149,824	250,269			325,457	530,018
Future principal payments of debt
2017 - July through December														1,041,040									1,041,040				1,041,040
2018														1,479,246									1,479,246				1,479,246
Total future principal payments														2,520,286									2,520,286				2,520,286
2018 end-of-term-payment														560,000									560,000				560,000
Total														3,080,286									3,080,286				3,080,286
Less: unaccreted end-of-term payment at June 30, 2017														(86,813)									(86,813)				(86,813)
Debt and unpaid accrued end-of-term payment														2,993,473									2,993,473				2,993,473
Short-term debt
Unamortized note discount														$ (20,854)	$ (134,433)								(20,854)				(20,854)		$ (42,493)
Nominal interest																							67,273	112,374			146,134	261,000
Total																							$ 149,824	$ 250,269			$ 325,457	$ 530,018
Loan and security agreement | Forecast
Debt and Warrants
Balloon amount payable on August 1, 2018	$ 560,000
Loan and security agreement | Prepayment during the first twelve months member
Debt and Warrants
Prepayment charge during first twelve months of loan when a minimum cash balance is required as a percent of minimum cash balance															2.00%
Prepayment charge during first twelve months of loan when a minimum cash balance is required as a percent of difference between amount being prepaid and minimum cash balance															3.00%
Prepayment charge during first twelve months of loan when no minimum cash balance is required as a percent of amount being prepaid															3.00%
Loan and security agreement | Prepayment after the first twelve months member
Debt and Warrants
Prepayment charge as a percent of amount being prepaid															1.00%
Convertible promissory note issued to Serious Change II LP
Debt and Warrants
Number of warrants issued to purchase shares of common stock (in shares) | shares			370,916		120,000
Exercise price (in dollars per share) | $ / shares			$ 0.51		$ 0.01
Loss on extinguishment of debt			$ 207,713		$ 108,000