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Description of the Company and Basis of Presentation - Revised Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ (1,678)	$ (2,025)	$ 4	$ 11,847	$ (2,511)	$ (6,056)	$ (3,699)	$ 3,280
Changes in operating assets and liabilities:
Contract assets							(379)	540
Income taxes payable							(5,985)	(2,742)
Deferred revenue							3,268	(2,318)
Net cash used in operating activities							$ 7,429	(13,662)
As Previously Reported
Cash flows from operating activities:
Net income			98	11,872	(2,461)	(5,671)		3,739
Changes in operating assets and liabilities:
Contract assets								(74)
Income taxes payable								(2,587)
Net cash used in operating activities								(13,662)
Adjustment
Cash flows from operating activities:
Net income			$ (94)	$ (25)	$ (50)	$ (385)		(459)
Changes in operating assets and liabilities:
Contract assets								614
Income taxes payable								$ (155)

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