Corporate Income Taxes - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 12, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Deferred tax liabilities, net		$ 61	$ 61
Valuation allowance		54,193	52,637	$ 60,368
State tax net operating loss carry-forwards		8,473
Pre-tax earnings of foreign subsidiary		(264)	277	762
Current tax provision		(63)	67	$ 183
Deferred tax liability		$ 529	$ 622
Effective income tax rate reconciliation		55.00%	(211.00%)	(321.00%)
Unrecognized tax benefits		$ 1,155	$ 1,155
Interest expense on unrecognized tax benefits			81	$ (334)
Total accruals for interest		785	704
Unrecognized tax benefits		1,187	$ 1,187	$ 1,187	$ 13,830
Estimate of possible loss	$ 4,722
Interest expense under examination	$ 2,044
Additional Paid-in Capital [Member]
Operating Loss Carryforwards [Line Items]
State tax net operating loss carry-forwards		$ 590