Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 88,427,000	$ 15,959,000
Marketable securities	18,091,000	25,607,000
Accounts receivable, net of allowances of $2,773 and $2,740, respectively	7,268,000	9,048,000
Inventories	7,105,000	6,633,000
Prepaid expenses and other current assets	1,324,000	1,202,000
Total current assets	122,215,000	58,449,000
Property and equipment, net	19,778,000	18,268,000
Intangible assets, net	2,923,000	2,670,000
Restricted cash	758,000	758,000
Other long-term assets	179,000	179,000
Total assets	145,853,000	80,324,000
Current liabilities
Accounts payable	6,665,000	8,703,000
Accrued compensation	4,502,000	5,650,000
Loan payable	19,275,000	7,935,000
Other current liabilities	3,557,000	4,133,000
Liabilities, Current	33,999,000	26,421,000
Long-term liabilities
Deferred rent	3,378,000	3,652,000
Long-term Debt, Excluding Current Maturities	14,901,000	11,880,000
Other non-current liabilities	222,000	220,000
Total liabilities	52,500,000	42,173,000
Stockholders’ equity
Preferred stock, $0.0001 par value; 5,000 authorized, none issued	0	0
Common stock, $0.0001 par value; 100,000 authorized; 54,665 and 46,554 shares issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	6,000	4,000
Additional paid-in capital	480,507,000	393,322,000
Accumulated deficit	(387,176,000)	(355,270,000)
Accumulated other comprehensive income	16,000	95,000
Total stockholders’ equity	93,353,000	38,151,000
Total liabilities and stockholders’ equity	$ 145,853,000	$ 80,324,000

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.