Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory rate (21% for 2019 and 2018, 35% for 2017)	$ (1,232)	$ (10,401)	$ (15,173)
State tax, net of federal tax benefit	1,956	(2,830)	(1,217)
Non-deductible expense and other	(266)	(300)	(830)
Effect of IP shift	8,125	0	0
Restricted stock units	55	833	(831)
Foreign tax rate differential	(532)	615	1,248
Federal/state research	519	0	0
GILTI	(1,244)	(299)	0
Mandatory repatriation of foreign earnings	0	0	(547)
Return to provision adjustment	760	778	(212)
Reserve related to unrecognized tax benefits	330	598	107
Interest and penalties	(6)	(6)	(1)
Effect of federal rate change	0	0	(11,806)
Effect of state rate changes, net of federal tax benefit	(227)	732	1,010
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(185)	(60)	0
Total reconciliation amount	$ 8,053	$ (10,340)	$ (28,252)

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.