Stockholders' Equity and Non-controlling Interest - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 10,940	$ 8,983
Other comprehensive income (loss) before reclassifications	(1,793)	(706)
Amounts reclassified from accumulated other comprehensive income	0	(199)
Transactions with non-controlling interests	(11)	(2)
Balance at the end of the period	(22,234)	10,940
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(580)	128
Other comprehensive income (loss) before reclassifications	(1,799)	(706)
Amounts reclassified from accumulated other comprehensive income	0	0
Transactions with non-controlling interests	(11)	(2)
Balance at the end of the period	(2,390)	(580)
Unrealized Gain (Loss) on Available-for-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(6)	193
Other comprehensive income (loss) before reclassifications	6	0
Amounts reclassified from accumulated other comprehensive income	0	(199)
Transactions with non-controlling interests	0	0
Balance at the end of the period	0	(6)
Total Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(586)	321
Balance at the end of the period	$ (2,390)	$ (586)