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Description of the Company and Basis of Presentation - Revised Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (2,025)	$ 4	$ (2,511)	$ (6,056)	$ (2,021)	$ (8,567)
Changes in operating assets and liabilities:
Contract assets					(2,026)	4,703
Income taxes payable					(5,870)	(6,139)
Deferred revenue					2,990	(1,758)
Net cash provided by (used in) operating activities					$ 4,381	(22,793)
As Previously Reported
Cash flows from operating activities:
Net loss		98	(2,461)	(5,671)		(8,133)
Changes in operating assets and liabilities:
Contract assets						4,123
Income taxes payable						(5,993)
Net cash provided by (used in) operating activities						(22,793)
Adjustment
Cash flows from operating activities:
Net loss		$ (94)	$ (50)	$ (385)		(434)
Changes in operating assets and liabilities:
Contract assets						580
Income taxes payable						$ (146)

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