Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (106,818,000)	$ (82,627,000)	$ (64,028,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Goodwill impairment	7,629,000	0	0
Intangible asset impairment	5,045,000	0	0
Depreciation and amortization	3,524,000	3,321,000	3,034,000
Provision for doubtful accounts	2,298,000	2,043,000	493,000
Provision for warranties	929,000	325,000	294,000
Provision for inventory	2,626,000	955,000	3,125,000
Change in fair value of warrants	(75,000)	(81,000)	95,000
Change in fair value of deferred consideration	100,000	24,000	(110,000)
Change in fair value of contingent consideration	1,044,000	2,528,000	1,135,000
Change in deferred revenue	1,124,000	627,000
Non-cash portion of debt extinguishment loss	53,000		17,000
Amortization of debt discount and issuance costs	359,000	174,000	140,000
Stock-based compensation expense	12,478,000	13,824,000	6,766,000
Loss on disposal of property and equipment	119,000	74,000	25,000
Deferred income taxes	18,000	(8,000)	(21,000)
Payments of contingent consideration liability in excess of acquisition-date fair value	(1,968,000)	(320,000)
Changes in assets and liabilities, net of effect from acquisitions:
Accounts receivable	(7,320,000)	(14,094,000)	(1,890,000)
Inventories	(10,921,000)	(4,144,000)	1,526,000
Prepaid expenses, other current assets and other assets	(8,513,000)	(1,302,000)	713,000
Insurance recovery receivable		39,000	9,336,000
Accounts payable	(2,225,000)	8,502,000	1,290,000
Accrued and other liabilities	7,795,000	7,885,000	3,218,000
Legal settlement payable	(410,000)	(590,000)	(9,900,000)
Customer deposits	4,008,000	4,513,000	(1,136,000)
Sales return liability	2,068,000	2,142,000
Net cash used in operating activities	(87,033,000)	(56,190,000)	(45,878,000)
Cash flows from investing activities:
Purchase of property and equipment	(4,071,000)	(855,000)	(1,864,000)
Business acquisitions, net of cash and restricted cash acquired	(17,943,000)		(18,150,000)
Net cash used in investing activities	(22,014,000)	(855,000)	(20,014,000)
Cash flows from financing activities:
Net proceeds from issuance of common stock	107,734,000	107,551,000
Proceeds from exercise of stock options	125,000	1,149,000	1,346,000
Proceeds from issuance of common stock under ESPP	1,216,000	993,000	647,000
Tax payments related to shares withheld for vested restricted stock units (RSUs)	(3,064,000)	(1,635,000)	(725,000)
Gross borrowings under the Term Loan	5,000,000	10,000,000	25,000,000
Gross borrowings under the Revolving Loan	22,296,000	12,109,000	5,000,000
Repayment of the Revolving Loan	(15,788,000)	(12,109,000)	(5,000,000)
Payments of contingent consideration up to acquisition-date fair value	(5,766,000)	(680,000)
Deferred financing costs	(1,997,000)	(22,000)	(657,000)
Net cash provided by financing activities	109,756,000	117,356,000	25,611,000
Net increase in cash, cash equivalents and restricted cash	709,000	60,311,000	(40,281,000)
Cash, cash equivalents and restricted cash at:
Beginning of period	87,242,000	26,931,000	67,212,000
End of period	87,951,000	87,242,000	26,931,000
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents	87,608,000	86,899,000	26,588,000
Restricted cash included in other assets	$ 343,000	$ 343,000	$ 343,000
Restricted Cash Noncurrent Asset Statement Of Financial Position Extensible List	us-gaap:OtherNoncurrentAssetsMember	us-gaap:OtherNoncurrentAssetsMember	us-gaap:OtherNoncurrentAssetsMember
End of period	$ 87,951,000	$ 87,242,000	$ 26,931,000
Supplemental disclosure of cash flow information:
Interest paid	4,089,000	3,120,000	870,000
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment in accounts payable and accrued liabilities	745,000	679,000	1,088,000
Acquisition of business, deferred and contingent consideration obligations at fair value	$ 9,063,000		10,912,000
Non-cash deferred consideration settlement		1,000,000
Non-cash settlement of assets held for sale in accounts payable		$ 2,674,000
Forgiveness of SVB Loan commitment fee			750,000
Deferred financing costs in accrued liabilities			$ 6,000