Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 159,570	$ 105,138
Short-term investments	43,250	103,353
Accounts receivable, net	43,086	41,850
Inventory	41,502	41,905
Prepaid expenses and other current assets	27,644	21,950
Total current assets	315,052	314,196
Property and equipment, net	22,788	22,737
Right-of-use lease assets	14,202	16,277
Other assets	346	346
Total assets	352,388	353,556
Current liabilities:
Accounts payable	5,885	525
Accrued clinical and manufacturing liabilities	17,151	49,962
Accrued payroll and employee liabilities	16,006	13,597
Other accrued liabilities	30,003	28,369
Current lease liabilities	3,251	2,997
Convertible notes payable to related parties, net of discount		7,053
Total current liabilities	72,296	102,503
Non-current lease liabilities	12,217	14,561
Non-current convertible notes payable, net	149,032
Total liabilities	233,545	117,064
Stockholders’ equity:
Common stock	1,019	913
Additional paid-in capital	1,676,613	1,628,070
Accumulated other comprehensive income (loss)	(4)	257
Accumulated deficit	(1,558,785)	(1,392,748)
Total stockholders’ equity	118,843	236,492
Total liabilities and stockholders’ equity	$ 352,388	$ 353,556