Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 164,235	$ 192,556
Other current assets	3,261	1,966
Total current assets	167,496	194,522
Property and equipment, net	6,113	3,570
Operating lease right-of-use assets	11,244	10,154
Intangible asset, net	238	347
Other non-current assets	1,932	1,926
Total assets	187,023	210,519
Current liabilities
Accounts payable and accrued liabilities	6,407	7,181
Operating lease liabilities	1,073	659
Finance lease liabilities	104	49
Total current liabilities	7,584	7,889
Non-current operating lease liabilities	12,300	11,306
Non-current finance lease liabilities	68	108
Total liabilities	19,952	19,303
Stockholders’ equity
Common stock - $0.000001 par value - authorized, 100,000,000 as of June 30, 2021 and December 31, 2020; issued and outstanding, 42,419,129 as of June 30, 2021 and 42,196,296 as of December 31, 2020.	0	0
Preferred stock - $0.000001 par value - authorized, 5,000,000 as of June 30, 2021 and December 31, 2020; issued and outstanding, 0 as of June 30, 2021 and December 31, 2020.	0	0
Additional paid-in capital	529,956	524,022
Accumulated deficit	(362,885)	(332,806)
Total stockholders’ equity	167,071	191,216
Total liabilities and stockholders’ equity	$ 187,023	$ 210,519

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