Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 7,888	$ 8,349
Accounts receivable, net of allowances of $38 and $52, respectively	1,687	669
Inventory	862	116
Other current assets	638	491
Total current assets	11,075	9,625
Property and equipment, net	1,669	894
Restricted cash	435	435
Intangible assets	845	973
Other assets	18	18
Total assets	14,042	11,945
Current liabilities
Accounts payable	2,183	1,626
Accrued liabilities	3,399	2,729
Deferred revenue	2,122	0
Billings on uncompleted contracts in excess of related costs	0	230
Total current liabilities	7,704	4,585
Deferred revenue, net of current portion	6,149	0
Deferred rent, net of current portion	342	488
Total liabilities	$ 14,195	5,073
Commitments and contingencies (Note 11)
Shareholders' equity (deficit)
Preferred stock, par value $0.001; 25,000 shares authorized; 0 and 0 shares issued and outstanding	$ 0	0
Common stock, par value $0.001; 100,000 shares authorized; 47,423 and 44,758 shares issued and outstanding at December 31, 2015 and 2014, respectively	47	45
Additional paid-in capital	483,171	475,656
Accumulated deficit	(483,371)	(468,829)
Total shareholders' equity (deficit)	(153)	6,872
Total liabilities and shareholders' equity (deficit)	$ 14,042	$ 11,945

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.