Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 83,513	$ 13,414
Short-term investments	81,703	37,724
Accounts receivable, net	10,327	1,960
Inventory	4,641	5,340
Prepaid expenses and other current assets	3,431	3,705
Total current assets	183,615	62,143
Property and equipment, net	5,680	5,076
Other assets	263	263
Total assets	189,558	67,482
Current liabilities:
Accounts payable	4,477	6,814
Accrued clinical liabilities	11,224	13,207
Accrued payroll and employee liabilities	6,122	8,414
Other accrued liabilities	7,244	6,288
Deferred revenue	5,235	1,099
Convertible notes payable to related parties, net of discount	3,096	2,911
Total current liabilities	37,398	38,733
Notes Payable, Related Parties, Noncurrent	50,000	50,000
Total liabilities	87,398	88,733
Stockholders’ equity (deficit):
Common stock	537	394
Additional paid-in capital	737,953	564,343
Accumulated other comprehensive loss	(30)	(17)
Accumulated deficit	(636,300)	(585,971)
Total stockholders’ equity (deficit)	102,160	(21,251)
Total liabilities and stockholders’ equity (deficit)	$ 189,558	$ 67,482