Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 103,285	$ 71,898
Short-term investments	253,061	319,074
Accounts receivable, net	34,811	39,879
Inventory	34,849	24,968
Prepaid expenses and other current assets	12,442	23,245
Total current assets	438,448	479,064
Property and equipment, net	21,908	19,618
Right-of-use lease assets	18,239	13,754
Other assets	346	346
Total assets	478,941	512,782
Current liabilities:
Accounts payable	11,562	2,758
Accrued clinical and manufacturing liabilities	35,321	34,614
Accrued payroll and employee liabilities	8,770	15,248
Other accrued liabilities	32,423	36,535
Current lease liabilities	2,755	1,926
Convertible notes payable to related parties, net of discount	5,934	5,624
Total current liabilities	96,765	96,705
Non-current lease liabilities	16,708	12,242
Total liabilities	113,473	108,947
Stockholders’ equity:
Common stock	906	903
Additional paid-in capital	1,580,903	1,568,317
Accumulated other comprehensive income	708	85
Accumulated deficit	(1,217,049)	(1,165,470)
Total stockholders’ equity	365,468	403,835
Total liabilities and stockholders’ equity	$ 478,941	$ 512,782