CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (24,138)	$ (8,278)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	673	567
Bad debt expense	0	4
Deferred income taxes	(91)	(883)
Stock-based compensation	10,919	0
Fair value adjustment for warrant liability	341	200
Loss on extinguishment of debt	384	0
Changes in assets and liabilities:
Accounts receivable	4,329	6,208
Prepaid expenses and other assets	(3,184)	(2,360)
Deferred commissions	(1,056)	(1,389)
Accounts payable and accrued expenses	1,202	(2,931)
Accrued compensation and related benefits	(339)	1,617
Other current liabilities	(75)	(1,377)
Deferred revenue	1,043	374
Other long-term liabilities	(143)	433
Net cash used in operating activities	(10,135)	(7,815)
Cash flows from investing activities:
Purchases of property and equipment	(295)	(935)
Net cash used in investing activities	(295)	(935)
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts	80,213	0
Payment of deferred initial public offering costs	(2,424)	0
Payment of dividend to Series A preferred stockholders	(7,565)	0
Proceeds from exercise of common stock options	664	0
Proceeds from issuance of long-term debt, net of debt issuance costs	19,616	20,000
Repayment of long-term debt	(40,000)	(10,000)
Net cash provided by financing activities	50,504	10,000
Effect of foreign exchange rate changes on cash and cash equivalents	1,072	(907)
Net increase in cash and cash equivalents	41,146	343
Cash and cash equivalents, beginning of period	31,143	31,393
Cash and cash equivalents, end of period	72,289	31,736
Supplemental disclosure of cash flow information:
Cash paid for interest	0	643
Cash paid for income taxes	484	580
Supplemental disclosure of non-cash financing activities:
Accretion of dividends on convertible preferred stock	357	642
Conversion of Convertible Preferred Stock to Common Stock
Supplemental disclosure of non-cash financing activities:
Conversion of convertible stock	48,207	0
Conversion of Convertible Preferred Stock Warrant to Common Stock Warrant
Supplemental disclosure of non-cash financing activities:
Conversion of convertible stock	$ 1,191	$ 0