Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (11,422)	$ (11,937)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	570	144
Provision for doubtful accounts	8	300
Provision for warranties	57	15
Provision for inventory	107	263
Change in fair value of warrants	(9)	15
Change in fair value of deferred and contingent consideration	64
Non-cash interest expense	8	1
Stock-based compensation expense	1,360	739
Loss on disposal of property and equipment		122
Deferred income taxes	25
Changes in assets and liabilities:
Accounts receivable	365	1,236
Prepaid expenses, other current assets and other assets	(1,420)	(399)
Inventories	1,178	279
Insurance recovery receivable	9,301
Accounts payable	(856)	(622)
Accrued and other liabilities	3,040	(1,236)
Legal settlement payable	(10,900)
Customer deposits	335	(1,317)
Net cash used in by operating activities	(8,189)	(12,397)
Cash flows from investing activities:
Purchase of property and equipment	(952)	(606)
Business acquisitions		(6,759)
Net cash used in investing activities	(952)	(7,365)
Cash flows from financing activities:
Proceeds from exercise of stock options	752	24
Proceeds from issuance of common stock under ESPP	324	430
Tax payments related to shares withheld for vested restricted stock units (RSUs)	(390)
Net cash provided by financing activities	686	454
Net decrease in cash and cash equivalents	(8,455)	(19,308)
Cash and cash equivalents at:
Beginning of period	67,212	112,801
End of period	58,757	93,493
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment in accounts payable and accrued liabilities	214
Acquisition of business, deferred and contingent consideration obligations at fair value		$ 550
Fair value of warrants to be issued	$ 88