CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 27,229	$ 29,761
Restricted cash	267	273
Short-term investments	53,317	44,057
Accounts receivable, net	29,806	29,925
Inventories	41,713	37,171
Prepaid expenses and other current assets	5,445	4,369
Total current assets	157,777	145,556
Property and equipment, net	7,872	7,337
Long-term investments	2,557	12,038
Intangible assets, net	23,315	26,081
Goodwill	21,672	21,867
Other assets	1,491	1,618
Total assets	214,684	214,497
Current liabilities:
Accounts payable	26,141	25,654
Accrued liabilities	8,296	10,835
Current portion of deferred revenue	4,990	4,538
Total current liabilities	39,427	41,027
Other long-term liabilities	4,164	3,942
Total liabilities	43,591	44,969
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock, $0.0001 par value; 500,000,000 shares authorized; 26,086,642 and 25,832,895 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	3	3
Additional paid-in capital	236,434	242,281
Accumulated deficit	(64,620)	(72,225)
Accumulated other comprehensive loss	(724)	(531)
Total stockholders' equity	171,093	169,528
Total liabilities and stockholders' equity	$ 214,684	$ 214,497

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.