Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 89,441	$ 86,769
Short-term investments	110	110
Other receivables	6,436	5,402
Contract asset	1,500
Prepaid expenses	1,016	1,558
Total current assets	98,503	93,839
Property, plant and equipment, net	1,376	1,327
Intangible assets, net	155	172
Long-term receivables	428	425
Total assets	100,462	95,763
Current liabilities:
Accounts payable	3,807	5,136
Accrued expense and other current liabilities	7,577	8,124
Total current liabilities	11,384	13,260
Non-current liabilities
Long-term debt	411	232
Other non-current liabilities	225	203
Total non-current liabilities	636	435
Total liabilities	12,020	13,695
Commitments and contingencies (Note 10)
Stockholders' Equity:
Ordinary shares, nominal value $0.01, 1,000,000,000 ordinary shares authorized at March 31, 2018; 36,707,685 and 40,233,867 issued and outstanding at December 31, 2017 and March 31, 2018, respectively	402	367
Preferred shares, par value $0.01, 100,000,000 shares authorized at March 31, 2018; None issued and outstanding
Additional paid in capital	380,553	360,872
Accumulated other comprehensive income	27	27
Accumulated deficit	(292,540)	(279,198)
Total stockholders' equity	88,442	82,068
Total liabilities and stockholders' equity	$ 100,462	$ 95,763