Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 17,646	$ 15,173	$ 7,556	$ 1,920					$ 42,295	$ 6,019	$ 28,795
Operating expenses:
Cost of products sold	$ 2,033	$ 1,744	$ 822	$ 138					$ 4,737	$ 0	$ 0
Cost, product and service, extensible enumeration	FOTIVDA U.S. product revenue, net	FOTIVDA U.S. product revenue, net	FOTIVDA U.S. product revenue, net	FOTIVDA U.S. product revenue, net					FOTIVDA U.S. product revenue, net	FOTIVDA U.S. product revenue, net	FOTIVDA U.S. product revenue, net
Research and development	$ 6,121	$ 7,502	$ 6,878	$ 5,797	$ 4,574	$ 5,860	$ 4,419	$ 7,826	$ 26,298	$ 22,679	$ 17,958
Selling, general and administrative	15,652	15,142	14,920	15,100	9,008	5,800	3,737	3,672	60,814	22,217	11,211
Operating expenses	23,806	24,388	22,620	21,035	13,582	11,660	8,156	11,498	91,849	44,896	29,169
Loss from operations	(6,160)	(9,215)	(15,064)	(19,115)	(12,696)	(8,060)	(7,407)	(10,714)	(49,554)	(38,877)	(374)
Other income (expense), net:
Interest expense, net	(1,153)	(1,153)	(1,128)	(611)	(522)	(419)	(349)	(315)	(4,045)	(1,605)	(1,815)
Change in fair value of PIPE Warrant liability	0	0	2,595	(2,396)	1,714	86	450	2,648	199	4,898	11,577
Other income	58	0	0	0					58	0	0
Other income (expense), net	(1,095)	(1,153)	1,467	(3,007)	1,192	(333)	101	2,333	(3,788)	3,293	9,762
Net income (loss)	$ (7,255)	$ (10,368)	$ (13,597)	$ (22,122)	$ (11,504)	$ (8,393)	$ (7,306)	$ (8,381)	$ (53,342)	$ (35,584)	$ 9,388
Basic net income (loss) per share
Net income (loss) per share (in dollars per share)	$ (0.21)	$ (0.30)	$ (0.40)	$ (0.81)	$ (0.44)	$ (0.33)	$ (0.42)	$ (0.52)	$ (1.63)	$ (1.66)	$ 0.61
Weighted average number of common shares outstanding (in shares)	34,384,000	34,374,000	34,362,000	27,429,000	26,252,000	25,808,000	17,364,000	16,081,000	32,661,000	21,402,000	15,331,000
Diluted net income (loss) per share
Net income (loss) per share (in dollars per share)	$ (0.21)	$ (0.30)	$ (0.40)	$ (0.81)	$ (0.44)	$ (0.33)	$ (0.42)	$ (0.52)	$ (1.63)	$ (1.66)	$ 0.61
Weighted average number of common shares outstanding (in shares)	34,384,000	34,374,000	34,362,000	27,429,000	26,252,000	25,808,000	17,364,000	16,081,000	32,661,000	21,402,000	15,376,000
FOTIVDA U.S. product revenue, net
Revenues:
Revenues	$ 16,755	$ 14,318	$ 6,735	$ 1,066					$ 38,874	$ 0	$ 0
Partnership licensing and royalty revenue
Revenues:
Revenues	$ 891	$ 855	$ 821	$ 854	$ 886	$ 3,600	$ 749	$ 784	$ 3,421	$ 6,019	$ 28,795