Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities
Net income (loss)	$ 682	$ (1,361)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization expense	128	356
Stock-based compensation	163	190
Change in fair value of preferred stock warrant liability	1,593
Changes in operating assets and liabilities:
Accounts receivable	3,411	(3,912)
Prepaid and other current assets	(343)	(496)
Other assets	345	(731)
Accounts payable	24	1,131
Accrued compensation and benefits	(125)	(377)
Other accrued liabilities	908	(572)
Deferred revenue	16,093	(2,863)
Deferred rent	(5)	(262)
Net cash provided by (used in) operating activities	22,874	(8,897)
Investing activities
Purchases of property and equipment	(736)	(257)
Net cash used in investing activities	(736)	(257)
Financing activities
Proceeds from issuance of common stock	61,241	2
Repurchase of unvested common stock		(2)
Net cash provided by financing activities	61,241
Net increase (decrease) in cash and cash equivalents	83,379	(9,154)
Cash and cash equivalents at beginning of period	34,435	32,903
Cash and cash equivalents at end of period	$ 117,814	$ 23,749