Summary of Significant Accounting Policies - Foreign Currency Translation (Details) € in Thousands, CZK in Thousands, $ in Thousands		3 Months Ended
	Jan. 01, 2002	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Jun. 01, 2015 CZK	Jan. 01, 2003 EUR (€)	Jan. 01, 2003 USD ($)	Jun. 30, 1998 CZK
Impact of foreign currency translation on goodwill
Residual balance		$ 5,241			€ 119	$ 3,710	CZK 124,509
Net cumulative change to goodwill due to foreign currency translation		1,531
Period over which goodwill was amortized	15 years
Stock-based Compensation
Stock-based compensation		$ 41	$ 15
Pilsen reporting unit
Impact of foreign currency translation on goodwill
Applicable Foreign Exchange Rate ("FX")		23.757					33.883
Residual balance		$ 4,339				3,042	CZK 103,072
Net cumulative change to goodwill due to foreign currency translation		$ 1,297
South-Moravia reporting unit
Impact of foreign currency translation on goodwill
Applicable Foreign Exchange Rate ("FX")		23.757					33.883
Residual balance		$ 766				537	CZK 18,195
Net cumulative change to goodwill due to foreign currency translation		$ 229
Lower Saxony reporting unit
Impact of foreign currency translation on goodwill
Applicable Foreign Exchange Rate ("FX")		23.757		27.245
Residual balance		$ 136		CZK 3,242	€ 119	$ 131
Net cumulative change to goodwill due to foreign currency translation		$ 5