Condensed consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 201,150	$ 143,093
Other current assets	5,439	503
Total current assets	206,589	143,596
Property and equipment, net	3,303	2,060
Operating lease right-of-use assets	10,398	770
Intangible asset, net	403	567
Other non-current assets	997	30
Total assets	221,690	147,023
Current liabilities
Accounts payable and accrued liabilities	9,522	4,125
Operating lease liabilities	321	556
Finance lease liabilities	49	62
Total current liabilities	9,892	4,743
Non-current operating lease liabilities	11,350	447
Non-current finance lease liabilities	108	146
Total liabilities	21,350	5,336
Stockholders’ equity
Common stock - $0.000001 par value - authorized, 100,000,000 as of September 30, 2020 and December 31, 2019; issued and outstanding, 41,876,590 as of September 30, 2020 and 37,996,849 as of December 31, 2019.
Preferred stock - $0.000001 par value - authorized, 5,000,000 as of September 30, 2020 and December 31, 2019; nil issued and outstanding as of September 30, 2020 and December 31, 2019.
Additional paid-in capital	520,506	441,216
Accumulated deficit	(320,166)	(299,529)
Total stockholders’ equity	200,340	141,687
Total liabilities and stockholders’ equity	$ 221,690	$ 147,023

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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

- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 65
-Paragraph 15
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682