Credit Facilities (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Credit Facility [Line Items]
Letters of credit outstanding	$ 0	$ 0
Threshold One
Credit Facility [Line Items]
Customer accounts receivable concentration limit	25.00%
Threshold Two
Credit Facility [Line Items]
Customer accounts receivable concentration limit	50.00%
Threshold Three
Credit Facility [Line Items]
Customer accounts receivable concentration limit	85.00%
Silicon Valley Bank
Credit Facility [Line Items]
Remaining borrowing capacity	$ 30,000,000
Credit facility | Silicon Valley Bank
Credit Facility [Line Items]
Borrowing capacity	$ 30,000,000
Effective interest rate (as a percentage)	4.00%
Possible Increase in financing facility	$ 20,000,000
Period for borrowing base requirement	90 days
Cash and cash equivalents, net of amount outstanding under credit agreement	$ 20,000,000
Variable rate basis	prime
Credit facility | Silicon Valley Bank | Prime Rate
Credit Facility [Line Items]
Interest rate over prime (as a percentage)	1.00%
Credit facility | Silicon Valley Bank | Required Borrowing Base Immediately Preceeding 90 Days
Credit Facility [Line Items]
Borrowing base requirement	$ 40,000,000
Letters of credit | Silicon Valley Bank
Credit Facility [Line Items]
Letters of credit outstanding	$ 0