Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 102,003	$ 86,769
Short-term investments	225	110
Other receivables	3,871	5,402
Contract asset	1,500
Prepaid expenses	1,154	1,558
Total current assets	108,753	93,839
Property, plant and equipment, net	1,139	1,327
Intangible assets, net	98	172
Long-term receivables	428	425
Total assets	110,418	95,763
Current liabilities:
Accounts payable	3,304	5,136
Accrued expense and other current liabilities	14,502	8,124
Total current liabilities	17,806	13,260
Non-current liabilities
Long-term debt	23,718	232
Other non-current liabilities	264	203
Total non-current liabilities	23,982	435
Total liabilities	41,788	13,695
Commitments and contingencies (Note 14)
Stockholders' Equity:
Ordinary shares, nominal value $0.01, 1,000,000,000 ordinary shares authorized at December 31, 2018; 36,707,685 and 67,019,094 issued and outstanding at December 31, 2017 and 2018, respectively	670	367
Preferred shares, par value $0.01, 100,000,000 shares authorized at December 31, 2018; None issued and outstanding
Additional paid in capital	461,911	360,872
Accumulated other comprehensive income	27	27
Accumulated deficit	(393,978)	(279,198)
Total stockholders' equity	68,630	82,068
Total liabilities and stockholders' equity	$ 110,418	$ 95,763