CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 53,289	$ 26,862
Short term investments	44,462	0
Accounts receivable (net of allowance for doubtful accounts of $286 and $249, respectively)	15,528	18,270
Inventory	3,638	3,793
Other current assets	2,339	1,581
Total current assets	119,256	50,506
Property and equipment, net	5,207	4,071
Total assets	124,463	54,577
Current liabilities:
Accounts payable	4,580	5,552
Accrued expenses	5,592	5,573
Deferred rent	534	420
Current portion of term loan credit agreement (net of deferred costs of $69 and $67, respectively)	4,097	350
Warrant liabilities	0	1,014
Other	189	181
Total current liabilities	14,992	13,090
Revolving and term loan credit agreement (net of deferred costs of $150 and $196, respectively)	13,183	16,888
Deferred rent	1,813	2,059
Total liabilities	29,988	32,037
COMMITMENTS AND CONTINGENCIES (Note 13)
Shareholders’ equity:
Common stock, no par value; shares authorized — 75,000; shares issued and outstanding — 43,170 and 35,861, respectively	468,447	383,020
Other comprehensive loss	(18)	0
Warrants	302	397
Accumulated deficit	(374,256)	(360,877)
Total shareholders’ equity	94,475	22,540
Total liabilities and shareholders’ equity	$ 124,463	$ 54,577