Organization and Business Activities (Details) $ / shares in Units, $ in Thousands				1 Months Ended						12 Months Ended
	Mar. 01, 2021 $ / shares shares	Mar. 11, 2020 USD ($)	Jul. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2020 employee	Sep. 30, 2020 employee	May 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 25, 2019 USD ($)
Liquidity
Cash, cash equivalents and short-term investments						$ 41,600				$ 41,600
Selling, general and administrative expenses										55,285	$ 62,485	$ 41,743
Number of sales representatives | employee							60	15
Proceeds from at-the-market facility										$ 7,520	$ 27,945	$ 24,219
Net proceeds from sale of stock									$ 35,200
Nominal value | $ / shares						$ 0.01				$ 0.01	$ 0.01
Public offering
Liquidity
Number of shares issued | shares						6,000,000				6,000,000
Shares Issued, Price Per Share | $ / shares						$ 2.50				$ 2.50
Proceeds from at-the-market facility						$ 15,000				$ 15,000
Net proceeds from sale of stock						$ 13,300				13,300
Public offering | Ordinary Shares
Liquidity
Number of shares issued | shares			1,818,181
Shares Issued, Price Per Share | $ / shares			$ 27
Proceeds from at-the-market facility			$ 50,000
Net proceeds from sale of stock			$ 46,300
Purchase agreement
Liquidity
Number of shares issued | shares									4,144,537
Proceeds from at-the-market facility									$ 38,000
Net proceeds from sale of stock									$ 35,200
Number of ordinary shares that can be purchased by warrant holders | shares									4,144,537
Share and warrant price | $ / shares									$ 9.1686
Jefferies LLC | At-the-market offering
Liquidity
Maximum aggregate gross proceeds under the sales agreement													$ 50,000	$ 50,000
Proceeds from at-the-market facility					$ 16,300					21,900
Net proceeds from sale of stock					$ 11,500					$ 20,400
Jefferies LLC | At-the-market offering | Ordinary Shares
Liquidity
Number of shares issued | shares					3,933,350					1,992,390
Jefferies LLC | Estimate | At-the-market offering
Liquidity
Number of shares issued | shares					3,933,350
Net proceeds from sale of stock					$ 11,500
Jefferies LLC | Estimate | At-the-market offering | Maximum
Liquidity
Proceeds from at-the-market facility					$ 16,300
Purchasers | Purchase agreement
Liquidity
Number of shares issued | shares									4,144,537		1,379,310
Proceeds from at-the-market facility											$ 20,000
Net proceeds from sale of stock											$ 18,300
Number of ordinary shares that can be purchased by warrant holders | shares									4,144,537		1
Share and warrant price | $ / shares									$ 9.1686		$ 14.50
Exercise price | $ / shares						$ 7.92				$ 7.92
Term						2 years				2 years
Warrants outstanding | shares						4,059,532				4,059,532
Loan Agreement | Term loan
Liquidity
Repayment of debt		$ 30,000								$ 30,000
Aggregate principal amount of debt outstanding		$ 35,000
Subsequent Event | Purchasers | Purchase agreement
Liquidity
Number of shares issued | shares	9,761,010			9,761,010
Net proceeds from sale of stock				$ 23,400
Proceeds from Issuance or Sale of Equity				$ 25,400
Number of ordinary shares that can be purchased by warrant holders | shares	4,880,505			4,880,505
Term				5 years
Subsequent Event | Ordinary Share Warrants | Purchasers | Purchase agreement
Liquidity
Number of ordinary shares that can be purchased by warrant holders | shares				300,000
Nominal value | $ / shares	$ 0.01			$ 0.01
Share and warrant price | $ / shares				2.4525
Exercise price | $ / shares				$ 2.39
Subsequent Event | Pre-Funded Warrants | Purchasers | Purchase agreement
Liquidity
Number of ordinary shares that can be purchased by warrant holders | shares				600,000
Share and warrant price | $ / shares				$ 2.4425
Exercise price | $ / shares				$ 0.01