Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Potentially Issuable Common Shares Excluded from Computation of Diluted Net Loss Per Share

The following potentially issuable common shares were not included in the computation of diluted net loss per share because they would have an anti-dilutive effect due to net losses at of the following at December 31 (in thousands):

	2018	2017	2016
Shares issuable upon the release of warrants	—	—	416
Shares issuable upon the release of restricted stock awards	76	24	40
Shares issuable upon exercise of stock options	8,091	7,328	6,857
	8,167	7,352	7,313