Significant Customers and Geographic Data Revenues and Accounts Receivable by Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Revenues	$ 10,119	$ 9,602	$ 8,764	$ 5,969	$ 8,335	$ 5,853	$ 8,404	$ 3,929	$ 34,454	$ 26,521	$ 17,736
Customer Concentration Risk | Revenues
Revenue, Major Customer [Line Items]
Revenues									34,454	$ 26,521	17,736
Customer Concentration Risk | Revenues | Customer A
Revenue, Major Customer [Line Items]
Revenues									4,375		1,941
Customer Concentration Risk | Current Receivables | Customer A
Revenue, Major Customer [Line Items]
Accounts Receivable	1,144								1,144		$ 294
Customer Concentration Risk | Current Receivables | Customer B
Revenue, Major Customer [Line Items]
Accounts Receivable	$ 1,173								$ 1,173