Condensed Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 29,722,622	$ 16,872,783
Short-term investments	54,171,847	0
Prepaid expenses	1,194,991	2,637,783
Other assets	462,840	539,659
Total current assets	85,552,300	20,050,225
Property and equipment, net	772,516	863,008
Deferred financing costs and other non-current assets	597,260	300,985
Total assets	86,922,076	21,214,218
Current liabilities:
Accounts payable	3,994,419	2,836,395
Accrued wages and benefits	888,430	155,102
Accrued interest payable	111,011	140,427
Current portion of long-term debt	5,606,830	4,318,078
Preferred stock warrants	0	223,032
Total current liabilities	10,600,690	7,673,034
Long-term debt, net of current portion	7,922,441	10,485,811
Subordinated notes	0	9,529,413
Other liabilities	637,500	637,500
Total liabilities	19,160,631	28,325,758
Convertible preferred stock, $0.001 par value, 14,310,992 shares authorized; 11,747,563 and 0, shares issued and outstanding at December 31, 2010 and June 30, 2011, respectively	0	89,799,483
Stockholders' equity (deficit):
Common stock: $0.001 par value, 100,000,000 shares authorized; 1,203,228 and 29,724,837 shares issued and outstanding at December 31, 2010 and June 30, 2011, respectively	29,725	1,203
Additional paid-in capital	183,478,546	1,156,681
Accumulated other comprehensive income	29,776	0
Retained deficit	(115,776,602)	(98,068,907)
Total stockholders' equity (deficit)	67,761,445	(96,911,023)
Total liabilities, convertible preferred stock, and stockholders' equity (deficit)	$ 86,922,076	$ 21,214,218