CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 318,852	$ 43,823
Operating expenses:
Cost of sales	26,342	12,862
Research and development expense	119,099	107,111
Selling, general and administrative	227,243	159,523
Total operating expenses	372,684	279,496
Loss from operations	(53,832)	(235,673)
Other income (expense):
Interest expense	(17,216)	(7,731)
Interest expense on mandatorily redeemable preferred shares	(7,917)	(7,943)
Interest expense on liability related to sale of future royalties	(17,314)	(13,508)
Change in fair value of derivatives	3,604	(210)
Gain from equity method investment	0	5,261
Other income (expense), net	81	(1,700)
Total other expense, net	(38,762)	(25,831)
Loss before provision for income taxes	(92,594)	(261,504)
Provision for income taxes	24,303	3,824
Net loss	(116,897)	(265,328)
Net loss attributable to non-controlling interests	498	360
Deemed dividend upon repurchase of preferred shares in consolidated subsidiary	(92,673)	0
Net loss attributable to common shareholders of Biohaven Pharmaceutical Holding Company Ltd.	$ (209,072)	$ (264,968)
Net loss per share attributable to Biohaven Pharmaceutical Holding Company Ltd - basic (in dollars per share)	$ (2.97)	$ (4.27)
Net loss per share attributable to Biohaven Pharmaceutical Holding Company Ltd - diluted (in dollars per share)	$ (2.97)	$ (4.27)
Weighted average common shares outstanding - basic (shares)	70,332,274	62,040,715
Weighted average common shares outstanding - diluted (shares)	70,332,274	62,040,715
Comprehensive loss:
Net loss	$ (116,897)	$ (265,328)
Other comprehensive (loss) income, net of tax	(2,325)	95
Comprehensive loss	(119,222)	(265,233)
Less: comprehensive loss attributable to non-controlling interests	498	360
Comprehensive loss attributable to Biohaven Pharmaceutical Holding Company Ltd.	(118,724)	(264,873)
Product revenue, net
Revenues:
Total revenues	123,590	43,823
Collaboration and other revenue
Revenues:
Total revenues	$ 195,262	$ 0