CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 7,307	$ 33,636
Short-term investments	76,235	66,905
Accounts receivable, net	21,052	17,447
Inventory	39,189	27,734
Prepaid expenses and other current assets	2,475	3,004
Total current assets	146,258	148,726
Property and equipment, net	16,987	14,929
Goodwill and other intangible assets, net	3,881	3,881
Total assets	167,126	167,536
Current liabilities:
Accounts payable	7,372	7,166
Accrued compensation and employee related benefits	4,195	7,647
Accrued liabilities	7,061	6,098
Current portion of long-term debt	3,479	2,589
Current portion of capital lease obligations	1,105	1,130
Current portion of deferred rent	295	306
Current portion of deferred revenue	590	445
Total current liabilities	24,097	25,381
Long-term debt, net of current portion	8,650	9,676
Capital lease obligations, net of current portion	1,443	1,698
Long-term liabilities — other	792	770
Deferred rent, net of current portion	5,958	5,022
Deferred revenue, net of current portion	960	966
Total liabilities	41,900	43,513
Stockholders' equity:
Preferred stock, $0.001 par value — 5,000 shares authorized, no shares issued and outstanding at March 31, 2017 and December 31, 2016
Common stock, $0.001 par value — 495,000 shares authorized, 20,615 and 20,336 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	21	20
Additional paid-in capital	314,614	311,216
Accumulated other comprehensive income (loss)	(46)	(10)
Accumulated deficit	(189,363)	(187,203)
Total stockholders' equity	125,226	124,023
Total liabilities and stockholders' equity	$ 167,126	$ 167,536

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).

Name:	us-gaap_AccountsPayableCurrent
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.