Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss)	$ 1,578	$ (1,736)	$ (1,397)	$ (9,343)	$ (158)	$ (10,740)
Denominator:
Denominator for basic income (loss) per share - weighted-average shares (in shares)	3,995,669		2,679,910		3,952,773	2,611,245
Effect of dilutive securities:
Equity incentive plans (in shares)	1,132,906		0		0	0
Denominator for diluted income (loss) per share (in shares)	5,128,575		2,679,910		3,952,773	2,611,245
Income (loss) per share - Basic (in dollars per share)	$ 0.39		$ (0.52)		$ (0.04)	$ (4.11)
Income (loss) per share - Diluted (in dollars per share)	$ 0.31		$ (0.52)		$ (0.04)	$ (4.11)