- Loan and Security Agreement (Details) - USD ($)			1 Months Ended	3 Months Ended
	Jul. 20, 2016	Jun. 30, 2014	Nov. 30, 2015	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Amount borrowed included in current liabilities				$ 3,873,438	$ 2,360,109
Amount borrowed, long-term liabilities				$ 12,699,739	$ 14,176,359
Loan and Security Agreement
Debt Instrument [Line Items]
Interest rate at end of period				5.25%
Accrued final payment				$ 41,030
Interest expenses recorded				30,267
Future minimum principal payments
Plus final fee premium accretion				41,030
Total long-term obligations				1,710,641
Prime Rate | Loan and Security Agreement
Debt Instrument [Line Items]
Interest above base rate			1.25%
Secured Debt
Debt Instrument [Line Items]
Face value of term loan		$ 15,000,000
Number of common shares that can be purchased upon exercise of warrant		85,470
Exercise price of warrants (in USD per share)		$ 3.51
Exercisable term of warrant		10 years
Amortized portion of final fee upon repayment				1,125,000
Amount borrowed included in current liabilities				3,247,334
Current portion of debt discount				252,666
Amount borrowed, long-term liabilities				11,615,202
Accrued final payment				308,654
Interest expenses recorded				465,956
Future minimum principal payments
2018				3,500,000
2019				6,000,000
2020				5,500,000
Total principal				15,000,000
Less discount				(446,118)
Plus final fee premium accretion				308,654
Total long-term obligations				$ 14,862,536
Secured Debt | Minimum
Debt Instrument [Line Items]
Pre-payment fees (as a percent)				1.00%
Secured Debt | Maximum
Debt Instrument [Line Items]
Pre-payment fees (as a percent)				3.00%
Secured Debt | Loan and Security Agreement
Debt Instrument [Line Items]
Number of common shares that can be purchased upon exercise of warrant	30,992	42,735		73,727
Exercise price of warrants (in USD per share)	$ 4.84
Exercisable term of warrant	10 years
Interest rate at end of period				7.75%
Value of warrants recorded as debt discount and additional paid in capital				$ 148,885
Secured Debt | Loan and Security Agreement | Minimum
Debt Instrument [Line Items]
Debt instrument stated rate	7.25%
Secured Debt | Prime Rate | Loan and Security Agreement
Debt Instrument [Line Items]
Interest above base rate	3.75%