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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation [Abstract]
Withholding taxes paid on shares issued upon conversion of RSUs				$ 47	$ 42
Stock-based compensation expense				2,712	3,026
Selling, General and Administrative Expense [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense		$ 565	$ 592	1,437	1,447
Research and Development Expense [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense		$ 434	$ 425	$ 1,275	$ 1,580
Stock Options [Member]
Share-based Compensation [Abstract]
Options granted (in shares)		0	85,000	345,000	1,095,000
Options granted, weighted average grant date fair value (in dollars per share)			$ 3.16	$ 4.63	$ 2.58
Dividend yield				0.00%	0.00%
Expected stock price volatility				92.00%	84.00%
Risk-free interest rate				2.09%	2.73%
Expected option term				6 years	6 years
Unrecognized stock-based compensation expense expected to be recognized related to non-vested stock options		$ 5,542		$ 5,542
Weighted average amortization period				2 years 3 months 22 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation [Abstract]
RSUs granted (in shares)		0	0	229,996	243,997
Weighted average grant date fair value of RSU's granted (in dollars per share)				$ 6.06	$ 3.26
Withholding taxes paid on shares issued upon conversion of RSUs				$ 47	$ 42
Unrecognized stock-based compensation expense expected to be recognized related to non-vested RSUs		$ 2,139		$ 2,139
Weighted average amortization period				2 years 7 months 2 days
2013 Plan [Member]
Share-based Compensation [Abstract]
Additional shares authorized for issuance (in shares)	2,500,000
Shares authorized for issuance (in shares)		16,624,469		16,624,469
Shares available for grant (in shares)		1,128,903		1,128,903

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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