Asset Acquisitions - Narrative (Details) - Austria Asset Purchase Agreement	Jan. 31, 2019 EUR (€) shares	Jan. 31, 2019 USD ($) shares
Schedule of Asset Acquisition, by Acquisition [Line Items]
Maximum payments to acquire assets upon achievement of milestones	€ 293,000	$ 335,000
Asset acquisition, consideration transferred, equity interests issued and issuable (in shares)	12,404	12,404