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Commitments and Contingencies - Warranty (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in the liability for product warranty claim costs
Balance at beginning of period	$ 41	$ 404	$ 6
Accruals for warranties issued during the period	1,178	416	398
Settlements (in cash or in kind) during the period	(866)us-gaap_ProductWarrantyAccrualPayments	(779)us-gaap_ProductWarrantyAccrualPayments	0us-gaap_ProductWarrantyAccrualPayments
Balance at end of period	$ 353	$ 41	$ 404

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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