Stockholders' Equity (Details) - USD ($)					1 Months Ended	12 Months Ended
	Sep. 23, 2020	Feb. 21, 2020	Feb. 06, 2020	Mar. 22, 2019	Feb. 29, 2020	Dec. 31, 2020	Dec. 31, 2019	Feb. 19, 2020	Feb. 04, 2020
Class of Stock [Line Items]
Preferred shares, shares authorized (in shares)						2,000,000	2,000,000
Preferred stock par value (in dollars per share)						$ 0.0001	$ 0.0001
Preferred shares, shares issued (in shares)						0	0
Preferred shares, shares outstanding (in shares)						0	0
Common stock authorized (in shares)						170,000,000	170,000,000
Common stock par value (in dollars per share)						$ 0.0001	$ 0.0001
Common shares, shares issued (in shares)						93,573,165	65,378,890
Common shares, shares outstanding (in shares)						93,573,165	65,378,890
Common stock issued on exercise of stock options (in shares)						0	30,000
Amount of common stock issued on exercise of stock options							$ 147,900
Weighted average exercise price (in dollars per share)							$ 4.93
Proceeds from issuance of common stock					$ 8,000,000.0
Remaining amount available for sale						$ 32,300,000
Amount allocated to common stock						$ 9,000	$ 7,000
Restricted stock awards - performance based
Class of Stock [Line Items]
Restricted common stock forfeited (in shares)						988,958
Restricted stock awards - time based
Class of Stock [Line Items]
Restricted common stock forfeited (in shares)						152,097
Restricted stock units
Class of Stock [Line Items]
Restricted common stock vested (in shares)						224,994
Shares withheld for tax withholding (in shares)						8,348
Tax withholding amount						$ 18,950
At-the-market offering
Class of Stock [Line Items]
Weighted average exercise price (in dollars per share)						$ 2.06	$ 2.92
Issuance of common stock (in shares)						1,128,608	1,840,443
Proceeds from issuance of common stock						$ 2,325,478	$ 5,383,079
Stock issuance costs							309,479
Commission and offering fees paid						63,000
Remaining amount available for sale						32,300,000
At-the-market offering | Maximum
Class of Stock [Line Items]
Sales agreement, threshold sale of shares				$ 40,000,000.0
Public offering
Class of Stock [Line Items]
Issuance of common stock (in shares)			3,191,489
Proceeds from issuance of common stock		$ 8,000,000.0				43,148,000	18,778,000
Stock issuance costs		$ 100,000				2,469,000	$ 1,490,000
Common stock reserved for future issuance (up to) (in shares)									3,670,212
Share price (in USD per share)			$ 2.22					$ 2.22
Over allotment option
Class of Stock [Line Items]
Common stock reserved for future issuance (up to) (in shares)								478,723	478,723
Registered direct offering
Class of Stock [Line Items]
Stock issuance costs	$ 2,300,000
Common stock reserved for future issuance (up to) (in shares)	21,818,544
Gross proceeds from issuance of common stock and warrants	$ 35,000,000.0
Placement agent, cash fee, percentage of aggregate gross proceeds raised in Offering	6.00%
Amount payable to financial advisory firm for services related to offering	$ 400,000
Placement agent, cash fee, percentage of aggregate gross proceeds from cash exercise of warrants issued to investors	6.00%
Placement agent, cash fee, percentage of aggregate gross proceeds from cash exercise of any warrants issued in the offering from the exercise of warrants during the remainder term of such warrants	4.00%
Placement agent fee, non-accountable expenses	$ 50,000
Placement agent fee, clearing fees	12,900
Amount allocated to common stock						$ 26,100,000
Proceeds from issuance of warrants	$ 8,900,000
Registered direct offering | Warrants
Class of Stock [Line Items]
Share price (in USD per share)	$ 1.51
Number of shares of common stock for which warrant is exercisable (in shares)	23,178,809
Number of shares of common stock each warrant is exercisable for (in shares)	1
Exercise price of warrant (in dollars per share)	$ 1.80
Maximum percentage of outstanding common stock able to be owned immediately after exercise of warrants	9.99%
Maximum percentage of outstanding common stock able to be owned immediately after exercise of warrants, at holder's option upon issuance	4.99%
Registered direct offering | Pre-Funded Warrants
Class of Stock [Line Items]
Number of shares of common stock for which warrant is exercisable (in shares)	1,360,265,000,000
Exercise price of warrant (in dollars per share)	$ 0.001