CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (14,542)	$ 1,068
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for transaction losses	4,612	2,857
Depreciation and amortization	3,542	3,135
Amortization of debt issuance costs	64	40
Change in fair value of redeemable convertible preferred stock warrant liability	3,610	41
Stock-based compensation expense	5,667	4,817
Loss (gain) on disposal of fixed assets	33	(3)
Changes in operating assets and liabilities:
Trade and client receivables	(15,137)	(7,239)
Prepaid expenses and other assets	(658)	183
Accounts payable	5,006	662
Accrued expenses and other liabilities	(490)	7,833
Deferred revenue	103	56
Net cash provided by (used in) operating activities	(8,190)	13,450
CASH FLOWS FROM INVESTING ACTIVITIES:
Increase in restricted cash	(94)	(1)
Purchases of property and equipment	(1,598)	(1,509)
Internal-use software and platform development costs	(2,670)	(392)
Net cash used in investing activities	(4,362)	(1,902)
CASH FLOWS FROM FINANCING ACTIVITIES:
Changes in funds held in escrow, including funds in transit	(20,283)	(12,016)
Changes in escrow funds payable	20,283	12,016
Proceeds from exercises of stock options and common stock warrant	7,011	1,494
Proceeds from exercise of redeemable convertible preferred stock warrant		260
Proceeds from borrowings on debt	15,000	15,000
Payment of debt issuance costs		(84)
Repayment of debt		(17,000)
Payments of deferred offering costs	(3,999)	(14)
Net cash provided by (used in) financing activities	18,012	(344)
NET INCREASE IN CASH	5,460	11,204
Cash, beginning of year	21,595	27,326
Cash, end of period	27,055	38,530
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes	7	12
Cash paid for interest	1,573	663
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Property and equipment purchased but not yet paid	166	77
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock		$ 144
Unpaid deferred offering costs	$ 1,583

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Balance Type:	credit
Period Type:	duration

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.5)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044

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Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

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Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration