Credit Facilities (Details) (USD $)	3 Months Ended
	Mar. 31, 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