Cash and Cash Equivalents and Restricted Cash - Geographic Information (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Sep. 04, 2015	Mar. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 56,077	$ 52,966		$ 97,102	$ 112,521
Restricted Cash [Abstract]
Restricted cash	4,623	4,623
United States [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	10,229	8,458
CHINA
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	29,596	28,681
Asia [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	5,313	5,346
Europe [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	8,251	8,093
South America [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	2,688	$ 2,388
Surety Bond [Member]
Restricted Cash [Abstract]
Restricted cash	$ 4,600		$ 4,600