Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 96,494	$ 22,465
Short-term investments	259,104	147,561
Accounts receivable, net	1,526	1,010
Inventory	514	381
Prepaid expenses and other current assets	7,009	5,130
Total current assets	364,647	176,547
Property and equipment, net of accumulated depreciation and amortization of $4,682 and $4,538, respectively	1,843	1,987
Goodwill	44,543	44,543
Operating lease right-of-use-assets	5,358	5,524
Other assets	828	828
Total assets	417,219	229,429
Current liabilities:
Accounts payable	8,067	14,389
Accrued liabilities	15,332	17,157
Total current liabilities	23,399	31,546
Long-term debt, net	99,874	99,508
Long-term operating lease liabilities	5,079	5,265
Total liabilities	128,352	136,319
Commitments and contingencies (Note 6)
Stockholders’ Equity:
Series A Convertible preferred stock, 2,304,147 and no shares issued, respectively	23	0
Common stock, $0.001 par value; 300,000,000 shares authorized; 247,764,761 and 245,792,668 shares issued, respectively	248	245
Additional paid-in capital	2,108,497	1,862,558
Accumulated deficit	(1,815,236)	(1,766,839)
Accumulated other comprehensive income/(loss)	(50)	31
Treasury stock, at cost, 1,528,008 and 867,973 shares, respectively	(4,615)	(2,885)
Total stockholders’ equity	288,867	93,110
Total liabilities and stockholders’ equity	$ 417,219	$ 229,429