Loan Agreement (Details) - Loan and Security Agreement (Loan Agreement) [Member] - Silicon Valley Bank (SVB) [Member]	Mar. 20, 2015 USD ($)
Line of Credit Facility [Line Items]
Debt Instrument, Debt default, Interest Rate	5.00%
Line of Credit Facility, Commitment Fee Amount	$ 75,000
Line of Credit Facility, Annual Commitment Fee Amount	12,500
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	30,000,000
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 15,000,000
Minimum
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Maximum
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
London Interbank Offered Rate (LIBOR) [Member] | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Prime Rate [Member] | Minimum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Prime Rate [Member] | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%