Stockholders' Equity (Details)							12 Months Ended
	Aug. 17, 2019 shares	Jul. 29, 2019 shares	Jun. 20, 2019 USD ($) $ / shares shares	Mar. 22, 2019 USD ($)	Oct. 15, 2018 USD ($) $ / shares shares	Aug. 07, 2018 director shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) director $ / shares shares	Dec. 31, 2017 shares
Class of Stock [Line Items]
Common stock authorized (in shares)		120,000,000					170,000,000	170,000,000
Common stock par value (in dollars per share) | $ / shares							$ 0.0001	$ 0.0001
Preferred shares, shares authorized (in shares)							2,000,000	2,000,000
Preferred stock par value (in dollars per share) | $ / shares							$ 0.0001	$ 0.0001
Increase in common stock shares authorized (in shares)		50,000,000
Preferred shares, shares issued (in shares)							0	0
Preferred shares, shares outstanding (in shares)							0	0
Common shares, shares issued (in shares)							65,378,890	57,034,154
Common shares, shares outstanding (in shares)							65,378,890	57,034,154
Common stock issued on exercise of stock options (in shares)							30,000	267,500
Amount of common stock issued on exercise of stock options | $							$ 147,900	$ 67,548
Exercised (in dollars per share) | $ / shares							$ 4.93	$ 3.09
Shares withheld for tax withholding								210,132
Amount of common stock repurchased | $								$ 759,028
Share price (in dollars per share) | $ / shares					$ 3.97			$ 3.61
Sales agreement (in shares) | $				$ 40,000,000
Issuance of Common Stock (in shares)					5,541,562
Issuance of common stock, net of issuance cost | $					$ 21,900,000
Warrant to purchase (in shares)					2,770,781
Exercise price (in dollars per share) | $ / shares					$ 4.96
Restricted stock awards - Performance based
Class of Stock [Line Items]
Forfeited (in shares)						333,200
Number of former directors | director						2		2
Restricted stock units
Class of Stock [Line Items]
Shares withheld for tax withholding							107,741
Vested (in shares)							322,820
Tax withholding amount | $							$ 279,346
Common stock
Class of Stock [Line Items]
Common shares, shares outstanding (in shares)							65,378,890	57,034,154	51,768,424
Common stock issued on exercise of stock options (in shares)							30,000
Common stock | Sales agreement
Class of Stock [Line Items]
Issuance of Common Stock (in shares)							1,840,443
Sale of stock consideration | $							$ 5,383,079
Weighted average share price (in dollars per share) | $ / shares							$ 2.92
Stock issuance costs | $							$ 309,479
Remaining amount available for sale | $							$ 34,600,000
Common stock | Offering
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares			$ 3.00
Issuance of Common Stock (in shares)			5,833,334
Sale of stock consideration | $			$ 17,500,002
Stock issuance costs | $			$ 1,379,323
Common stock | Over-allotment option
Class of Stock [Line Items]
Issuance of Common Stock (in shares)			425,800
Sale of stock consideration | $			$ 1,200,000
Maximum | Common stock | Offering
Class of Stock [Line Items]
Issuance of Common Stock (in shares)			6,708,334
Maximum | Common stock | Over-allotment option
Class of Stock [Line Items]
Issuance of Common Stock (in shares)	875,000