License Agreements (Details) - Antecip - License Agreements - item	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2012
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Number of exclusive license agreements	3	3
License agreement royalty, maximum reduction percent as a result of required third party payments		50.00%
License agreement term, from first commercial sale		10 years
AXS-02
Research and Development Arrangement, Contract to Perform for Others [Line Items]
License agreement royalty as a percent of net sales		4.50%
AXS-05
Research and Development Arrangement, Contract to Perform for Others [Line Items]
License agreement royalty as a percent of net sales		3.00%
AXS-04
Research and Development Arrangement, Contract to Perform for Others [Line Items]
License agreement royalty as a percent of net sales		1.50%