Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 86,019	$ 102,003
Restricted cash	392
Short-term investments	175	225
Accounts receivable, net and other receivables	2,744	3,871
Contract asset		1,500
Inventory	682
Prepaid expenses	1,158	1,154
Total current assets	91,170	108,753
Property, plant and equipment, net	2,474	1,139
Intangible assets, net	91	98
Long-term receivables	378	428
Total assets	94,113	110,418
Current liabilities:
Accounts payable	4,673	3,304
Accrued expense and other current liabilities	11,966	14,502
Total current liabilities	16,639	17,806
Non-current liabilities
Long-term debt	34,502	23,718
Other non-current liabilities	1,698	264
Total non-current liabilities	36,200	23,982
Total liabilities	52,839	41,788
Commitments and contingencies (Note 17)
Stockholders’ Equity:
Ordinary shares, nominal value $0.01, 1,000,000,000 ordinary shares authorized at December 31, 2019; 67,019,094 and 94,545,116 issued and outstanding at December 31, 2018 and December 31, 2019, respectively	945	670
Preferred shares, par value $0.01, 100,000,000 shares authorized at December 31, 2019; None issued and outstanding
Additional paid in capital	517,044	461,911
Accumulated other comprehensive income	27	27
Accumulated deficit	(476,742)	(393,978)
Total stockholders’ equity	41,274	68,630
Total liabilities and stockholders’ equity	$ 94,113	$ 110,418