Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 38,993	$ 39,084
Accounts receivable	3,387	3,503
Supplies inventory	3,502	3,767
Prepaid expenses and other current assets	1,395	1,442
Restricted cash	120	118
Total current assets	47,397	47,914
Property and equipment, net	10,937	10,314
Finite-lived intangible assets, net	14,666	15,200
Goodwill	1,057	1,057
Restricted cash	603	603
Other assets	172	159
Total assets	74,832	75,247
Current liabilities:
Accounts payable	2,705	5,085
Accrued liabilities	8,910	8,689
Deferred Genzyme co-promotion fee	227	948
Total current liabilities	11,842	14,722
Long-term debt	24,671	4,990
Deferred rent, net of current portion	4,566	4,283
Total liabilities	41,079	23,995
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued and outstanding as of June 30, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value; 125,000,000 shares authorized, 27,864,285 and 27,685,291 shares issued and outstanding as of June 30, 2016 and December 31, 2015, respectively	28	28
Additional paid-in capital	203,769	199,950
Accumulated deficit	(170,044)	(148,726)
Total stockholders’ equity	33,753	51,252
Total liabilities and stockholders’ equity	$ 74,832	$ 75,247

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.