Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 61,546	$ 21,462
Prepaid expenses and other current assets	1,820	1,556
Total current assets	63,366	23,018
Property and equipment, net	665	704
In-process research and development	5,500	5,500
Intangible assets, net	3,548	3,605
Goodwill	16,363	16,363
Restricted cash	1,825	1,825
Other assets	218	374
Total assets	91,485	51,389
Current liabilities:
Accounts payable	2,658	2,483
Accrued expenses	2,722	4,101
Deferred revenue	38	50
Other current liabilities	556	557
Deferred tax benefit	185	185
Total current liabilities	6,159	7,376
Long term debt, net of debt discount	7,298	7,282
Deferred revenue, net of current portion	1,201	946
Deferred tax liability	2,166	2,166
Deferred tax benefit, net of current portion	507	553
Other non-current liabilities	534	665
Commitments and contingencies (Note 15)
Stockholders' equity
Preferred stock $0.001 par value; Authorized - 5,000,000 shares; Issued and Outstanding - 0 shares at March 31,2015 and December 31, 2014, respectively
Common stock, $0.001 par value; Authorized-- 300,000,000 shares; Issued-- 23,528,110 and 12,934,102 shares at March 31, 2015 and December 31, 2014, respectively; Outstanding-- 23,514,851 and 12,920,843 shares at March 31, 2015 and December 31, 2014, respectively	24	13
Additional paid-in capital	167,688	118,959
Accumulated deficit	(94,092)	(86,571)
Total stockholders' equity (deficit)	73,620	32,401
Total liabilities, convertible preferred stock and stockholders' equity	$ 91,485	$ 51,389