Commitments and Contingencies - Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Schedule of Changes in Reserve for Product Warranty Claim Costs
Balance at beginning of period	$ 353	$ 41
Accruals for warranties issued during the period	0	216
Settlements (in cash or in kind) during the period	(329)	(41)
Balance at end of period	$ 24	$ 216