Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 112,507	$ 124,860	[1]
Receivable from related party	55	223	[1]
Deferred tax assets	73	73	[1]
Prepaid expenses and other current assets	959	685	[1]
Total current assets	113,594	125,841	[1]
Non-current assets:
Property and equipment, net	3,729	3,442	[1]
Deferred tax assets	607
Total non-current assets	4,336	3,442	[1]
Total assets	117,930	129,283	[1]
Current liabilities:
Accounts payable	779
Accrued research and development	5,698	47	[1]
Income taxes payable	300	27	[1]
Other current liabilities	2,306	1,670	[1]
Total current liabilities	9,083	1,744	[1]
Non-current liabilities:
Deferred rent	1,417	1,055	[1]
Deferred tax liability	201
Total liabilities	10,701	2,799	[1]
Shareholders' equity:
Euro deferred shares, €22 nominal value: Authorized shares - 10,000 at June 30, 2013 and December 31, 2012 Issued and outstanding shares - none at June 30, 2013 and December 31, 2012			[1]
Ordinary shares, $0.01 par value: Authorized shares - 100,000,000 at June 30, 2013 and December 31, 2012 Issued and outstanding shares - 17,679,182 at June 30, 2013 and December 31, 2012	177	177	[1]
Additional paid-in capital	127,650	126,652	[1]
Accumulated deficit	(20,598)	(345)	[1]
Total shareholders' equity	107,229	126,484	[1]
Total liabilities and shareholders' equity	$ 117,930	$ 129,283	[1]

[1] Amounts have been derived from the December 31, 2012 audited consolidated financial statements.