Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 49,660	$ 86,019
Restricted cash	229	392
Short-term investments	175	175
Accounts receivable, net and other receivables	3,228	2,744
Inventory	5,196	682
Prepaid expenses	3,921	1,158
Total current assets	62,409	91,170
Property, plant and equipment, net	2,176	2,474
Intangible assets, net	97	91
Long-term receivables	368	378
Total assets	65,050	94,113
Current liabilities:
Accounts payable	2,620	4,673
Accrued expense and other current liabilities	8,376	11,966
Total current liabilities	10,996	16,639
Non-current liabilities
Long-term debt	7,477	34,502
Other non-current liabilities	2,116	1,698
Total non-current liabilities	9,593	36,200
Total liabilities	20,589	52,839
Commitments and contingencies (Note 12)
Stockholders' Equity:
Ordinary shares, nominal value $0.01, 1,000,000,000 ordinary shares authorized at June 30, 2020; 94,545,116 and 142,965,483 issued and outstanding at December 31, 2019 and June 30, 2020, respectively	1,430	945
Preferred shares, par value $0.01, 100,000,000 shares authorized at June 30, 2020; None issued and outstanding
Additional paid in capital	558,446	517,044
Accumulated other comprehensive income	27	27
Accumulated deficit	(515,442)	(476,742)
Total stockholders' equity	44,461	41,274
Total liabilities and stockholders' equity	$ 65,050	$ 94,113