CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (28,747)	$ (17,508)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	20,124	15,377
Amortization of deferred financing costs and debt discount	6,566	4,603
Deferred taxes	(3,875)	(6,633)
Stock-based compensation	14,310	13,758
Change in fair value of acquisition-related contingent consideration	600	3,006
Acquisition-related contingent consideration paid		(24,450)
Other noncash items		12
Changes in operating assets and liabilities, net of effect from acquisitions:
Accounts receivable, net	(7,773)	(2,383)
Inventories	(403)	(89)
Prepaid expenses and other current assets	3,815	(1,468)
Other assets	(4)	(140)
Accounts payable	(1,588)	(5,571)
Accrued expenses and other liabilities	(49)	5,661
Other long-term liabilities	412	(40)
Net cash provided by (used in) operating activities	3,388	(15,865)
Cash flows from investing activities:
Purchases of property and equipment	(1,447)	(3,508)
Software development costs	(8,898)	(6,618)
Proceeds from repayment of note receivable		1,000
Acquisitions of businesses, net of cash acquired		(158,762)
Net cash used in investing activities	(10,345)	(167,888)
Cash flows from financing activities:
Proceeds from exercise of stock options	2,312	1,536
Payments for debt financing costs		(9,477)
Repayments of line of credit		(45,000)
Payments of acquisition-related contingent consideration		(20,342)
Repayments of long-term debt and finance leases	(52)	(541)
Proceeds from issuance of convertible senior subordinated notes		325,000
Proceeds from sale of warrants		65,910
Purchase of convertible note hedges		(101,660)
Net cash provided by financing activities	2,260	215,426
Net (decrease) increase in cash and restricted cash	(4,697)	31,673
Cash and restricted cash, beginning of period	46,581	25,029
Cash and restricted cash, end of period	41,884	56,702
Supplemental disclosure of cash flow information:
Purchases of property and equipment and software development included in accounts payable and accrued expenses	239	291
Cash paid for interest	2,846	364
Cash paid for taxes	228	279
Interest costs capitalized to property and equipment and software development costs	$ 132	$ 148
Stock issued in connection with acquisitions		9,504