Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	$ (25,063)	$ (19,634)	$ (17,875)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of deferred implementation, solution and other costs	5,007	4,435	2,837
Depreciation and amortization	6,847	4,083	2,971
Amortization of debt issuance costs	96	96	68
Amortization of premiums on investments	319	17	0
Stock-based compensation expenses	7,362	4,570	1,605
Loss from discontinued operations	0	0	199
Deferred income taxes	85	0	0
Allowance for sales credits	38	65	57
Loss on disposal of long-lived assets	0	0	18
Unoccupied lease charges	0	0	236
Changes in operating assets and liabilities:
Accounts receivable, net	(3,322)	3,991	(3,267)
Prepaid expenses and other current assets	(150)	(628)	(414)
Deferred solution and other costs	(4,659)	(5,329)	(4,011)
Deferred implementation costs	(4,118)	(3,842)	(3,155)
Other long-term assets	(1)	(244)	(1,539)
Accounts payable	1,343	(842)	1,326
Accrued liabilities	4,056	(1,398)	5,523
Deferred revenue	14,021	9,224	9,706
Deferred rent and other long-term liabilities	3,538	150	4,444
Net cash provided by (used in) continuing operations	5,399	(5,286)	(1,271)
Net cash used in discontinued operating activities	0	0	(236)
Net cash provided by (used in) operating activities	5,399	(5,286)	(1,507)
Cash flows from investing activities:
Purchases of investments	(43,928)	(23,216)	0
Maturities of investments	20,908	2,230	0
Purchases of property and equipment	(7,128)	(5,036)	(11,138)
Business combinations, net of cash acquired	(27,469)	0	0
Purchase of intangible assets	0	0	(125)
Increase in restricted cash	(486)	(713)	0
Cash included in distribution of spin-off	0	0	(46)
Net cash used in investing activities	(58,416)	(26,735)	(11,309)
Cash flows from financing activities:
Proceeds from issuance of preferred stock, net of issuance costs	0	0	18,995
Proceeds from borrowings on line of credit	0	12,500	6,350
Payments on line of credit	0	(18,710)	(2,682)
Payments on financing obligations	(4,241)	0	0
Payments on capital lease obligations	(418)	(748)	(718)
Proceeds from the issuance of common stock, net of issuance costs	52,575	86,286	0
Proceeds from exercise of stock options to purchase common stock	4,192	2,017	435
Shares acquired to settle the exercise of stock options	(21)	(20)	0
Net cash provided by financing activities	52,087	81,325	22,380
Net increase (decrease) in cash and cash equivalents	(930)	49,304	9,564
Cash and cash equivalents, beginning of period	67,979	18,675	9,111
Cash and cash equivalents, end of period	67,049	67,979	18,675
Supplemental disclosures of cash flow information:
Cash paid for taxes	60	55	164
Cash paid for interest	212	419	377
Supplemental disclosure of non-cash investing activities:
Acquisition consideration payable to seller - working capital adjustment	95	0	0
Acquisition consideration payable to seller - hold back	2,500	0	0
Equipment acquired under capital lease	0	0	975
Data center assets acquired under financing arrangements	4,087	5,209	0
Purchased software and licenses [Member]
Cash flows from investing activities:
Purchase of intangible assets	$ (313)	$ 0	$ 0