Credit Facilities - Additional Information (Details) - USD ($)		9 Months Ended
	Sep. 28, 2016	Sep. 30, 2016	Apr. 20, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Line Of Credit Facility [Line Items]
Debt prepayment penalty and final payment fee		$ 200,000
Cash and cash equivalents		111,712,000		$ 17,256,000	$ 17,550,000	$ 19,686,000
Subordinated Loan And Security Agreement
Line Of Credit Facility [Line Items]
Debt prepayment penalty and final payment fee	$ 200,000
Repayments of loan agreement		0
Senior Credit Facility
Line Of Credit Facility [Line Items]
Repayment of senior credit facility	10,000,000
Unamortized debt issuance costs		$ 500,000
Credit facility, covenant terms		If the Company’s cash and cash equivalents, as defined in the senior credit facility, are below $25 million as of the last day of the applicable monthly measuring period, the Company will be required to comply with a financial covenant based on subscription and professional services bookings. This financial covenant is measured both monthly and quarterly, generally on a trailing six month basis.
Cash and cash equivalents		$ 25,000,000
Senior Credit Facility | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Term loan borrowings		$ 0		$ 0
Credit facility frequency of interest payments		monthly
Credit facility expiration date		Jun. 16, 2017
Senior Credit Facility | SVB and ORIX Ventures, LLC | Term Loan Borrowings
Line Of Credit Facility [Line Items]
Term loan borrowings			$ 20,000,000
Senior Credit Facility | Silicon Valley Bank | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Maximum borrowings capacity		$ 15,000,000
Subordinated Debt
Line Of Credit Facility [Line Items]
Repayment of subordinated loan	$ 10,000,000