Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 17,514,213	$ 22,604,481
Supplies for clinical trials	1,321,604	1,158,632
Other assets	612,373	797,425
Total current assets	19,448,190	24,560,538
Property and equipment, net	164,567	180,922
Supplies for clinical trials	1,308,867	1,115,657
Deposits	3,762,878	4,176,280
Deferred financing costs	8,593	48,977
Total assets	24,693,095	30,082,374
Current liabilities:
Accounts payable	920,030	1,161,258
Accrued compensation and benefits	215,408	790,487
Accrued liabilities	1,136,448	317,653
Total current liabilities	2,271,886	2,269,398
CIRM liability	4,398,732	4,133,905
Warrant liability	1,492,400	1,958,775
Total liabilities	$ 8,163,018	$ 8,362,078
Commitments and contingencies (Note 5)
Shareholders’ equity:
Common stock, $0.0001 par value; 249,000,000 shares authorized; 91,727,797 and 90,310,149 shares issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	$ 9,173	$ 9,031
Additional paid-in capital	96,291,989	95,849,005
Accumulated deficit	(79,771,085)	(74,137,740)
Total shareholders’ equity	16,530,077	21,720,296
Total liabilities and shareholders’ equity	$ 24,693,095	$ 30,082,374

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).

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Data Type:	xbrli:monetaryItemType
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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).