Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 31,768	$ 34,324
Prepaid expenses and other current assets	1,564	2,606
Total current assets	33,332	36,930
Property and equipment, net	29,640	10,142
Building construction in progress		19,978
Total assets	62,972	67,050
Current liabilities:
Accounts payable	1,730	4,431
Accrued expenses	1,062	3,532
Total current liabilities	2,792	7,963
Long-term liabilities:
Deferred rent	18	23
Total liabilities	2,810	7,986
Shareholders’ equity:
Preferred Stock, no par value, unlimited shares authorized, no shares outstanding	0	0
Common stock, no par value, unlimited shares authorized, 35,439,272 and 32,627,691 shares outstanding at December 31, 2017 and December 31, 2016, respectively	277,492	242,419
Accumulated other comprehensive loss	(768)	57
Accumulated deficit	(216,562)	(183,412)
Total shareholders’ equity	60,162	59,064
Total liabilities and shareholders’ equity	$ 62,972	$ 67,050

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).