Stockholders' Equity And Stock-Based Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2020

Stockholders' Equity And Stock-Based Compensation Expense [Abstract]

Common Stock Outstanding and Stockholders' Equity

	Common Stock	Stockholders' equity (in thousands)
Balance at December 31, 2018	17,219,300	$	19,628
Non-cash stock-based compensation for:
Stock options for employees	—		342
Stock options for non-employees	—		2
Issuance costs from sale 2018 sale of common stock and warrants	—		(60)
Net loss	—		(1,359)
Balance at March 31, 2019	17,219,300	$	18,553
Balance at December 31, 2019	21,841,810	$	22,099
Non-cash stock-based compensation for:
Stock options for employees	—		261
Stock options for non-employees	—		9
Proceeds from exercise of common stock warrants	2,888,092		3,613
Net loss	—		(1,150)
Balance at March 31, 2020	24,729,902	$	24,832

Stock Options And Unvested Performance Award Outstanding Activity

	Stock Options	Performance Awards
Outstanding as of December 31, 2019	3,210,965	138,055
Options granted	25,000	—
Options exercised	—	—
Options forfeited/canceled	—	—
Outstanding as of March 31, 2020	3,235,965	138,055

Non-Cash Stock-Based Compensation Expenses

	Three months ended
	March 31,
	2020		2019
Research and development	$	115	$	137
General and administrative		155		207
Total non-cash stock-based compensation expense	$	270	$	344