Debt - Additional Information (Detail)		12 Months Ended
	Aug. 01, 2016 USD ($) Tranche	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Repayment of line of credit		$ 16,246,000	$ 15,000,000	$ 7,000,000
Unamortized debt cost		600,000
Unaccreted debt discount		700,000
Letters of credit amount		$ 4,200,000
Letters of credit, expiration year, start		2017
Letters of credit, expiration year, end		2023
Building Leases [Member]
Line of Credit Facility [Line Items]
Costs recognized agreements term		7 years
Maximum [Member]
Line of Credit Facility [Line Items]
Costs recognized agreements term		3 years
Maximum [Member] | Equipment Leases [Member]
Line of Credit Facility [Line Items]
Costs recognized agreements term		3 years
Minimum [Member]
Line of Credit Facility [Line Items]
Costs recognized agreements term		1 year
Minimum [Member] | Equipment Leases [Member]
Line of Credit Facility [Line Items]
Costs recognized agreements term		1 year
Tranche Three [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity under loan agreement		$ 5,000,000
SVB Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility and term loan termination date		Aug. 01, 2016
Term Loan [Member]
Line of Credit Facility [Line Items]
Repayment of line of credit	$ 6,000,000
Hercules Capital, Inc., [Member] | Secured Loan Agreement [Member]
Line of Credit Facility [Line Items]
Loan agreement date		Aug. 01, 2016
Maturity period of credit facility		Feb. 01, 2020
Maximum borrowing capacity under loan agreement	$ 30,000,000
Number of allowed tranches to borrow as per agreement | Tranche	3
Annual variable interest rate, description		equal to the greater of (i) 9.75% plus the prime rate minus 3.50% or (ii) 9.75%.
Payment-in-kind interest rate	2.15%
Frequency of periodic payment		Monthly payments are interest only until December 1, 2017, subject to extension until March 1, 2018 or June 1, 2018 depending on whether certain financial milestones are met. After the interest-only period, principal and interest will be due in equal monthly payments.
Percentage of prepayment changes for due in year one outstanding amount	3.00%
Percentage of prepayment changes for due in year two outstanding amount.	2.00%
Percentage of prepayment changes for due in year three outstanding amount.	1.00%
Minimum required covenants percentage of trailing six month subscription revenue	80.00%
Number of trailing months of subscription revenue		6 months
Minimum required covenants unrestricted cash	$ 7,500,000
Minimum required covenants EBITDA for two consecutive quarters	1,000,000
Expected revised minimum required covenants unrestricted cash after two consecutive quarters.	$ 6,000,000
Hercules Capital, Inc., [Member] | Secured Loan Agreement [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Annual interest, stated percentage	9.75%
Hercules Capital, Inc., [Member] | Secured Loan Agreement [Member] | Prime Rate [Member]
Line of Credit Facility [Line Items]
Variable interest rate	3.50%
Hercules Capital, Inc., [Member] | Secured Loan Agreement [Member] | Tranche One [Member]
Line of Credit Facility [Line Items]
Borrowed amount under loan agreement	$ 22,500,000
Hercules Capital, Inc., [Member] | Secured Loan Agreement [Member] | Tranche Two [Member]
Line of Credit Facility [Line Items]
Maturity period of credit facility		Sep. 15, 2017
Maximum borrowing capacity under loan agreement	2,500,000
Line of credit facility, initiation date		Jul. 01, 2017
Hercules Capital, Inc., [Member] | Secured Loan Agreement [Member] | Tranche Three [Member]
Line of Credit Facility [Line Items]
Maturity period of credit facility		Sep. 15, 2018
Maximum borrowing capacity under loan agreement	$ 5,000,000
Line of credit facility, initiation date		Sep. 15, 2017