CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (18,094)	$ (2,593)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	4,048	1,765
Amortization of deferred financing costs and debt discount	21	22
Deferred taxes	(94)	95
Stock-based compensation	1,945	3,821
Change in fair value of acquisition-related contingent consideration	13,521	21
Changes in operating assets and liabilities:
Accounts receivable, net	(3,285)	(2,163)
Inventories	124	(110)
Rebates receivable	(6)	(3)
Prepaid expenses and other current assets	(499)	(275)
Other assets	282	(1)
Accounts payable	(1,770)
Accrued expenses and other liabilities	4,064	1,296
Other long-term liabilities	(48)	102
Net cash provided by operating activities	209	1,977
Cash flows from investing activities:
Purchases of property and equipment	(1,122)	(865)
Software development costs	(1,060)	(800)
Net cash used in investing activities	(2,182)	(1,665)
Cash flows from financing activities:
Payments for repurchase of common stock	(2,866)
Proceeds from exercise of stock options	920	50
Payments for employee taxes for shares withheld		(88)
Payments for debt financing costs	(2)	(18)
Payments of equity offering costs	(357)	(132)
Payments of contingent consideration	(1,646)	(1,498)
Repayments of long-term debt	(254)	(166)
Net cash used in financing activities	(4,205)	(1,852)
Net decrease in cash	(6,178)	(1,540)
Cash, beginning of period	10,430	4,345
Cash, end of period	4,252	2,805
Supplemental disclosure of cash flow information:
Acquisition of equipment under capital leases	442	50
Additions to property, equipment, and software development purchases included in accounts payable and accrued expenses	390	330
Cash paid for interest	43	51
Employee payroll taxes on net exercise of stock options included in accrued expenses	$ 182	$ 1,970