Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 80,728	$ 71,898
Short-term investments	220,114	319,074
Accounts receivable, net	37,502	39,879
Inventory	41,442	24,968
Prepaid expenses and other current assets	13,109	23,245
Total current assets	392,895	479,064
Property and equipment, net	21,886	19,618
Right-of-use lease assets	17,594	13,754
Other assets	346	346
Total assets	432,721	512,782
Current liabilities:
Accounts payable	18,458	2,758
Accrued clinical and manufacturing liabilities	30,173	34,614
Accrued payroll and employee liabilities	11,193	15,248
Other accrued liabilities	23,728	36,535
Current lease liabilities	2,830	1,926
Convertible notes payable to related parties, net of discount	6,269	5,624
Total current liabilities	92,651	96,705
Non-current lease liabilities	16,012	12,242
Total liabilities	108,663	108,947
Stockholders’ equity:
Common stock	908	903
Additional paid-in capital	1,594,436	1,568,317
Accumulated other comprehensive income	953	85
Accumulated deficit	(1,272,239)	(1,165,470)
Total stockholders’ equity	324,058	403,835
Total liabilities and stockholders’ equity	$ 432,721	$ 512,782