Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Letter Bond Contract	Dec. 31, 2015 USD ($)
Operating Leases, Future Minimum Payments Due [Abstract]
2017	$ 925
2018	809
2019	817
2020	651
2021	616
Thereafter	946
Total	4,764
Rent Expense [Abstract]
Rent expense	800	$ 1,200
Standby Letters of Credit, Bank Guarantees, Surety Bonds and Performance Bonds [Abstract]
Standby letters of credit and surety bonds	$ 1,000
Number of standby letters of credit | Letter	4
Number of surety bonds | Bond	1
Number of bid bonds contract | Contract	4
Number of stand by letters of credit deposited in escrow accounts | Letter	4
Restricted cash and investments	$ 1,100	$ 3,600